The Free Flyknit 4.0 is the newest addition to the Nike family, replacing the V3. This shoe is a intermediate shoe in the free series, with the 3.0 being the most minimalist featuring a 4mm drop. Featuring all textile upper and lining this is a very cozy and comfy on lining. with great traction from its man made rubber sole. Textile Upper Textile Lining Synthetic Sole